Ssh-2.0-cisco-1.25 Vulnerability Jun 2026

A: No. Modern Cisco platforms run a completely different SSH stack (often based on OpenSSH) and report different version strings (e.g., SSH-2.0-Cisco-2.0 or SSH-2.0-OpenSSH_8.2 ).

While the SSH-2.0-Cisco-1.25 string is often associated with legacy code, the risk is not confined to the past. Cisco has disclosed several high-severity vulnerabilities in recent years that affect modern products and their SSH implementations.

If immediate patching is not possible, consider temporarily disabling RSA-based public key authentication if it is the primary vector for a known bypass. CVE-2020-3200 Detail - NVD

Security scanners (like Nessus or Qualys) often flag this banner because it reveals the device's operating system and version, which can help an attacker identify known vulnerabilities. Below is a breakdown of what this banner means and the actual vulnerabilities often associated with it. What is SSH-2.0-Cisco-1.25? ssh-2.0-cisco-1.25 vulnerability

The phrase is a standard identification banner sent by many Cisco devices when a remote connection is initiated . While the banner itself is not a vulnerability, it acts as a "fingerprint" that tells attackers exactly what version of the Cisco SSH software is running, which helps them target specific known flaws.

The string is a version identifier frequently returned by the Secure Shell (SSH) server on Cisco IOS and IOS XE devices during a protocol handshake. While this specific string describes the Cisco implementation of the SSH-2.0 protocol rather than a single vulnerability, devices reporting this version have recently been linked to a maximum-severity flaw (CVSS 10.0) in the underlying Erlang/OTP SSH server implementation. The Critical Erlang/OTP SSH Vulnerability

As of this writing, a query for "SSH-2.0-Cisco-1.25" on Shodan reveals approximately devices directly exposed to the public internet. The geographic distribution is alarming: Below is a breakdown of what this banner

Security scanners do not flag ssh-2.0-cisco-1.25 as a vulnerability itself. They flag it because .

: Confirms that the target device uses the Secure Shell Version 2 framework. Cisco : Identifies the device vendor.

: Monitor system logs and AAA servers for unusual SSH activity, such as repeated failed connection attempts or connection attempts from unexpected IP addresses, which could indicate scanning or exploitation attempts. ssh-2.0-cisco-1.25 vulnerability

This persistent history demonstrates that the SSH-2.0-Cisco-1.25 banner is not just an identifier; it is a flag indicating a long legacy of management plane vulnerabilities that require constant vigilance.

Pre-Authentication State Machine Exploitation (Denial of Service)